I know this is common sense and nearly everyone follows the same thing but just sharing to new players how to do it for those new in the game as Group Demonstration and Scouting Combine might be confusing for them.
I spent 40k per week since the start of the season as there were many inactive managers, I have about 32 points, and only continue reading this if you want 18 year old talents (for obvious reasons).
First use Scouting Combine. It cost 10 points, and lets you know the ages and height of the player (both important for serious people in the draft).
If you have enough points for Group Demonstration, use it only IF there are more than 10 players over the age of 18 considered grey 2 ball and 1 ball players (which never was any accurate). If there's less than 10, it'd be more economical to scout them once individually.
From there, you're on your own :D But I'd look at 18 year olds with high Star Rating, Age, and Height to choose which one to reveal the potential.